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Device and method for purifying flue gas

A purification device and flue gas purification technology, applied in chemical instruments and methods, separation methods, sulfur trioxide/sulfuric acid, etc., can solve the problems of increasing the complexity of the structure of the desulfurization tower, and achieve excellent corrosion resistance and short construction period Effect

Inactive Publication Date: 2007-12-12
娄爱娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This also increases the complexity of the desulfurization tower structure

Method used

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  • Device and method for purifying flue gas
  • Device and method for purifying flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] A 440T / h fluidized bed boiler, burning coal with a sulfur content of 1.5%, and a flue gas flow rate of 500,000 Nm 3 / hr, SO 2 The content is 3200mg / Nm 3 , the content of other pollutants in the flue gas is: dust = 80mg / Nm 3 , SO 3 =55mg / Nm 3 , HCl=35mg / Nm 3 , HF=20mg / Nm 3 , NOx=100mg / Nm 3 , the flue gas temperature is 120°C.

[0099] In this embodiment, the ammonia method is used for desulfurization and purification. The desulfurization raw material is an ammonia water mixture with an ammonia weight concentration of 18%, and the desulfurization by-product is ammonium sulfate.

[0100] The washing and purification device mainly includes the following equipment:

[0101] A booster fan 2, a purification tower 1, a circulation pump 4 (one can also be used as a backup), a set of ammonium sulfate dehydration device 3 (composed of hydrocyclones, centrifuges and dryers), a Oxidation fan 5 (one can also be spared), and a demister 8 arranged in the outlet flue.

[0102]...

Embodiment 2

[0112] Example 1 is desulfurized and purified by calcium method. The raw material for desulfurization is crushed and ground limestone with a particle size of less than 325 mesh and greater than 90%. The limestone slurry with a solid content of 15% of limestone is prepared.

[0113] The by-product of desulfurization is dihydrate gypsum, CaSO4.2H 2 O.

[0114] The main equipment configuration is as follows:

[0115] One booster blower 2, one purification tower 1, one circulation pump 4 (one can also be spared), one set of ammonium sulfate dehydration device 3 (composed of hydrocyclone and vacuum filter), one oxidation blower 5 (one can also be spared), and the demister 8 arranged in the outlet flue.

[0116] The size of the purification tower 1 is the same as in Embodiment 1.

[0117] The tower body 101 of the purification tower 1 is made of glass fiber reinforced plastic, namely FRP material.

[0118] The desulfurization raw material is supplemented on the inlet pipeline of...

Embodiment 3

[0126] Example 1 is desulfurized and purified by the magnesium method. The raw material for desulfurization is magnesium oxide, and the particle size is less than 150 mesh and greater than 90%. It is prepared into a magnesium oxide slurry with a solid content of 15%.

[0127] Desulfurization by-product is magnesium sulfate heptahydrate, MgSO4.7H 2 O.

[0128] The main equipment configuration is as follows:

[0129] A booster blower 2, a purification tower 1, a circulating pump 4 (one can also be spared), a set of ammonium sulfate dehydration device 3 (by hydrocyclone and centrifuge), an oxidation blower 5 ( Also can spare one), and the demister 8 arranged in the outlet flue.

[0130] The size of the purification tower 1 is the same as in Embodiment 1.

[0131] The tower body 101 of the purification tower 1 is made of glass fiber reinforced plastic, namely FRP material.

[0132] The desulfurization raw material is supplemented on the inlet pipeline of the circulating pump, ...

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Abstract

The boiler smoke purification device comprises a cleaning and absorbing component at the relatively higher position, being able to absorb slid grain wastes, poisonous gas, particularly an alkali lye diffusion component for absorbing oxides of sulfur wastes. Smoke goes into the above cleaning absorbing component, then the cleaning absorbing circulation component of lower latitude, with the latter connected to the said cleaning absorbing component. The cleaning absorbing circulation component can be used for the separation of solid grain wastes and treatment of poisonous gases. It is low in investment, small in energy consumption, strong in gas treatment ability, high in efficiency, applicable for mass mode industrial application.

Description

technical field [0001] The invention relates to a flue gas purification device, in particular to a removal and purification treatment device for sulfur oxides and other pollutants in boiler flue gas. Background technique [0002] Boilers or thermal power plants that use coal or oil as fuel emit large amounts of flue gas. These flue gases contain harmful gaseous substances such as SOx, NOx, HCl, and HF, as well as pulverized coal dust containing solids such as aluminum oxide, silicon oxide, and iron oxide. Among them, sulfur oxides SOx, including SO 2 and SO 3 , is the main substance that forms acid rain. [0003] SO 2 The content is usually 300~5000ppmv (1000~15000mg / Nm 3 ), the dust content is 100-300mg / Nm 3 between. However, the amount of flue gas is huge. In terms of coal-fired boilers, the steam scale ranges from 35T / h to 2500T / h, the capacity of the generating set ranges from 6MW to 1000MW, and the flue gas amount varies from 50,000 Nm 3 / h to 2.5 million Nm 3 ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D47/14C01B17/62C01B17/69
Inventor 娄爱娟
Owner 娄爱娟
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